Before the Iraq war I was quite disturbed by some of the neoconservatives, who were saying things like, "What is the point of being a superpower if you can't do such-and-such, take on these responsibilities?" The point of being a superpower is that people will leave you alone.
When most people speak of natural law, what they have in mind is the contention that morality can be derived from human nature. If human beings are rational animals of such-and-such a sort, then the moral virtues are...(filling in the blanks is the difficult part).
That he heard the Prophet saying, "It is not permissible for a man to be alone with a woman, and no lady should travel except with a Muhram (i.e. her husband or a person whom she cannot marry in any case for ever; e.g. her father, brother, etc.)." Then a man got up and said, "O Allah's Apostle! I have enlisted in the army for such-and-such Ghazwa and my wife is proceeding for Hajj." Allah's Apostle said, "Go, and perform the Hajj with your wife."
The Apostle of Allah (peace_be_upon_him) said on the day of Badr: He who kills a man will get such-and-such, and he who captivates a man will get such-and-such. The narrator then transmitted the rest of the tradition in a similar manner. The tradition of Khalid is more perfect.